[S-IT25] [EE] New constraints on the asthenosphere and its role in plate tectonics

Sat. May 20, 2017 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL7)

The Earth's asthenosphere represents a critical region that can control the influence tectonic plates and other surficial processes have on the Earth's deeper mantle, and vice versa. The composition of the Earth's tectonic plates is largely a result of magmatism at mid-ocean ridges and arc systems, and accumulation from below (underplating), which is in turn modulated by the physics and chemistry present in the asthenosphere. Uncertainties in the forces that drive tectonic plates largely arise from incomplete descriptions of the asthenosphere's mechanical properties. Visco-elastic processes ranging from post-seismic deformation to glacial isostatic adjustment are also influenced by the asthenosphere. Recent modeling techniques and new datasets, particularly from the seafloor and subduction zones, have allowed for a better characterization of the asthenosphere. We seek contributions from any discipline from observation to theory, including seismology, geodesy, chemistry, geology, magnetotellurics, and geodynamics, that shed light on the chemistry and physics of continental or oceanic asthenosphere.

[SIT25-P01] Estimation of electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data

*Tetsuo Matsuno¹, Kiyoshi Baba², Hisashi Utada² (1.Kobe Ocean Bottom Exploration Center, Kobe University, 2.Earthquake Research Institute, University of Tokyo)

[SIT25-P02] Layered seismic anisotropic structure of the subducting asthenosphere in the Cocos subduction zone

*Cheng-Chien Peng¹, Ban-Yuan Kuo², Chin-Wu Chen¹ (1.Institute of Oceanography, National Taiwan University, 2.Institute of Earth Sciences, Academia Sinica)

[SIT25-P03] Radial anisotropy as "bodywave-surface wave discrepancy"

*Hitoshi Kawakatsu¹ (1.Earthquake Research Institute, University of Tokyo)

[SIT25-P04] Constraints on mantle flow in the oceanic upper mantle from a high-resolution estimate of seismic velocities in the central Pacific

*James B Gaherty¹, Joshua B Russell¹, Peiying (Patty) Lin² (1.Lamont Doherty Earth Observatory, 2.Taiwan Ocean Research Institute)

[SIT25-P05] Waveform modeling of BBOBS data for old oceanic lithosphere-asthenosphere system

*Junpei Maruyama¹, Nozomu Takeuchi¹, Hitoshi Kawakatsu¹ (1.Earthquake Research Institute, University of Tokyo)

[SIT25-P06] Super-weak asthenosphere in light of plate motions and azimuthal anisotropy

*Thorsten W Becker¹ (1.Jackson School of Goesciences, The University of Texas at Austin)

[SIT25-P07] Significance of sediment reverberations on receiver functions of broadband OBS data

*Yuki Abe¹, Hitoshi Kawakatsu² (1.Hot Springs Research Institute of Kanagawa Prefecture, 2.Earthquake Research Institute, The University of Tokyo)

[SIT25-P08] The impact of temporal stress variations, dynamic disequilibrium, and asthenospheric channels on the initiation of plate tectonics

*Vlada Stamenkovic^1,2, Tobias Höink³, Adrian Lenardic³ (1.California Institute of Technology, 2.Jet Propulsion Laboratory, 3.Rice University)

[SIT25-P09] Diffusion creep of fine-grained olivine aggregates : Chemical and melt effects

*Kosuke Yabe¹, Takehiko Hiraga¹ (1.Earthquake Research Institute, The University of Tokyo)

[SIT25-P10] Water sensitivity of the rheology and seismic properties of upper-mantle olivine

Ulrich H Faul¹, Christopher J Cline II², Emmanuel C David^2,3, Andrew J Berry², *Ian Jackson² (1.Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, USA, 2.Research School of Earth Sciences, Australian National University, Canberra, Australia, 3.Department of Earth Sciences, University College London, London, UK)

[SIT25-P11] Temperature dependency of the electrical grain boundary transport in forsterite aggregates

*Kenta Sueyoshi¹, Takehiko Hiraga¹ (1.Earthquake Research Institute, The University of Tokyo)

[SIT25-P12] Thermal & petrological structure of lithospheric mantle deciphered from xenoliths from Ichinomegata, NE Japan.

*Yuto Sato¹, Kazuhito Ozawa¹ (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)

Session information